Lens system



July 27 1926. 1,593,786

Y J. H. WORTHlNGTON LENS SYSTEM Filed June 11, 1924 j gy/ a'yb PatentedJuly 27, 1926.

JAMES H. WORTHINGTON, 0F CARMEL, CALIFORNIA.

LENS SYSTEM.

Application filed June 11, 1924. Serial No. 719,320.

My invention has for its particularobject the production of an imagethrough a lens system of large aperture, superior definition and shortfocus'whereby shorter photographic exposures are required.

This result I attainby combining in series three or more convergentlenses, preferably of equal focal length and so placed that the image ofa distant object obtained through my lens system is closer to theoptical center of the series and covers a relatively larger field thanhas heretofore been obtainable.

The mounting comprises a plurality of lenses in series Within the minormedial section of the focal length of one of them.

By referring to the accompanying drawings my invention will be madeclear.

Fig. 1 represents a conventional lens sys' tem, in horizontal section. v

Figs. 2, 3 and t are similar to Fig. 1 except that the lenses arearranged according to my invention.

'lhroughout the figures similar letters refer to identical parts.

In Fig. 1 rays of light from lens A from an infinitely distant objectwould normally focus at- F, the distance AF, the focal length of ti elens, is now to be divided in medial section at B satisfying the formula(EFF: Al inil the result will be that the focal point of the system ABwill be at 1.

I have found that if now we interpose a similar lens 0 midway between Aand B the focal plane J will be much closer to the lens C than beforeand the distance BJ vxill be substantially equal to the distanceCBZVQIALB. I

If on the other hand the distance AB be divided into three parts andadditional duplicate lenses D and E be mounted there 1 between the focalplane K will be much closer to B and the distance BK will besubstantially one-third of the distance AB;

if the distance AB be divided into four equal parts and three similarlenses F, G, H,

focal length may be made equal to 1 or aperture even less.

And with this combination I have obtained excellent photographs ofbuildings in forty seconds illuminated only by moonlight, and in threehours illuminated by starlight alone.

I claim:

1. A lens system comprising a pair of lenses positioned on theextremities of the minor medial section of the focal length of one ofthem and another lens equidistant between the lenses of said pair all ofsaid lenses being convergent and'similar.

2. A. lens system comprising a pair of lenses positioned on theextremities of the minor medial section of the focal length of one ofthem andL another lens equidistant between the lenses of saidpair all ofsaid lenses being ofthe same focal length all of said lenses beingconvergent and similar.

3. A lens system comprising more than two convergent and similar lensesequally spaced on the minor medial section of the focal length of one ofthem. I

A lens system comprising more than two convergent and similar lensesequally spaced on the minor medial section of the focal length of one ofthem, all of said lenses being of the same aperture and focal length.

5. A lens system comprising a pair of convergent similar lensespositioned on the extremity of the minor medial section of the focallength of one of them and a plurality of similar lenses equidistantlyspaced between said first pair of lenses.

JAMESH. WORTHINGTON.

